pierson



L. s. PERSON. FIREPROOF FLOOR 0R CEILING.

(No Model.)

No. 533,201. PatentedJan. 29, 1895.

A TTOHNEY.

@einen Srnrns LEVI S. PIERSON, OF INDIANAPOLIS, INDIANA.

FIREPROOF FLOOR OR CEILING.

SPECIFICATION forming part of Letters Patent No. 533,201, dated January 29, 1895. Application led November Z8, 1894. Serial No. 530.283. (No model.)

To all whom t may concern:

Be it known that l, Lnvr S. PIERsoN, a citi- Zen of the United States, residing at Indianapolis, in the county of Marion and State of Indiana, have invented a new and usefnllmprovement in Fireproot Floors or Ceilings, of which the following is a specifica-tion.

My invention relates to an improvement in the construction of lire-proof floors and ceilings.

The object of my improvement is, to avoid, in that class of lire-proof floors which consist of concrete supported by iron girders, the necessity for the use of false-work to support the concrete when soft.

The accompanying drawings illustrate my invention.

Figure l represents a transverse section of looring constructed with my improvement. Fig. 2 represents a plan of the same without the concrete. Fig. 3 represents, on a larger scale, a View in perspective of one of the slabs forming the ceiling, and the means for supporting it. Fig. 4 represents a View in perspective of one of the intermediate ceiling slabs.

In the drawings, 2, 2, indicate a pair of iron girders which support a section of ilooring. Said girders are connected by a series of straps, 3, 3, formed of light bar-iron, and eX- tending across the space between thegirders.

The construction thus far is well known and common in this class of flooring, the space above and below the straps being filled with cement concrete.

I-Ieretofore, in constructing this class of lflooring, it has been necessary to erect below the connecting straps and between the girders, a false work of wood, t0 receive and support the concrete while soft. To avoid the construction of such a false work, and to form a ceiling for the room below, I form in suitable molds a series of slabs, 4, similar to that shown in Fig. 3, from cement concrete, clay, or other plastic material. The longer edges of said slabs are rabbeted as at 5, and are provided in said edges with notches, 6. Several series of slabs thus formed, arranged endto end, are suspended from the straps 3, at intervals between the girders, by means of hang ers, 7, 7. Each of said hangers is formed with a vertical portionyS, and laterally projecting arms 9, and lO, the vertical portion of the hanger entering the notch 6 inthe edge of the slab, one of the lateral arms engaging the under surface of the slab, while the other arm engages the strap. For the purpose of nicely adjusting and leveling the slabs, a wedge l1, is inserted underthat arm of each ot the hangers which engages the strap. The several series of slabs 4 having been placed in position the spaces between them are filled by a series of similar slabs, l2, shown in Fig. 4, having rabbeted portions, 13, adapted to interlock with the opposed edges of two of the series of slabs 4, thus forming a continuous surface below the straps, and suspended therefrom by the hangers 7. The space above the surface thus formed being filled with concrete in the usual manner, the concrete adheres to the slabs and forms a solid mass therewith in which the straps and the hangers depending therefrom are embedded.

I claim as my inventionl. In a fire-pro0f floor, the combination of the pair of girders, the series of straps connecting said girders, a continuous surface composed of separately molded slabs of plas tic material arranged below said straps and suspended therefrom b vsnitable hangers, and

,a mass of concrete resting upon said slabs Vand embedding said straps and hangers, substantially as set forth.

2. In a lire-proof floor, the combination of the pair ot girders, the series of straps connecting said girders, a continuous surface composed of separately molded slabs ot plastic material arranged below said straps and suspended therefrom by suitable hangers, means for adjusting said hangers vertically relatively to said straps, and a mass of concrete resting upon said slabs and embedding said straps and hangers, substantially as set forth.

3. In a fire-proof door, the combination of the pair of girders, the series of straps connecting said girders, the separately molded slabs 4, having rabbeted edges 5, and notches 6, said slabs being arranged in series and suspended at intervals from said straps be- IOO tween said girders by means of hangers surface is formed below the straps and susadapted to enter said notches and provided pended therefrom, substantially as and for with a pair of lateral arms one of which enthe purpose specified.

gages the slab and the other of which en- LEVI S. PIERSON. 5 gages the strap, and intermediate separately WVitnesses:

molded slabs 12 arranged to ll the spaces V. M. HOOD,

between said slabs 4, whereby a continuous f H. P. HOOD. 

